新兴流动信号与彩弦融合

Physics Pub Date : 2024-02-20 DOI:10.3390/physics6010019
Daria Prokhorova, Evgeny Andronov
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引用次数: 0

摘要

在这项研究中,我们基于多波美拉尼亚子交换情景,建立了粒子产生的色弦模型,以解决质子-质子非弹性相互作用中测得的流动信号的争议性起源问题。我们的方法考虑了弦-弦相互作用,但不包括流体力学阶段。我们考虑了弦的综合三维动力学,它导致在事件中形成强异质弦密度。后者是粒子产生的源泉。弦融合机制是模型的一个主要特征,它改变了粒子的产生并产生了方位各向异性。通过比较模型分布和 ATLAS 实验质子-质子在质心能量 s=13 TeV 下的数据,固定了模型参数。双粒子角相关函数 C(Δη,Δj)的结果显示了共振贡献和近侧脊。双粒子累积量 c2{2} 和二阶流动谐波 v2{2} 的模型计算也是使用双子事件法进行的,与数据在质量上一致。在模型结果中观察到的偏离脊的缺失被解释为弦系统横向演化时间定义的不完善。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Emergent Flow Signal and the Colour String Fusion
In this study, we develop the colour string model of particle production, based on the multi-pomeron exchange scenario, to address the controversial origin of the flow signal measured in proton–proton inelastic interactions. Our approach takes into account the string–string interactions but does not include a hydrodynamic phase. We consider a comprehensive three-dimensional dynamics of strings that leads to the formation of strongly heterogeneous string density in an event. The latter serves as a source of particle creation. The string fusion mechanism, which is a major feature of the model, modifies the particle production and creates azimuthal anisotropy. Model parameters are fixed by comparing the model distributions with the ATLAS experiment proton–proton data at the centre-of-mass energy s=13 TeV. The results obtained for the two-particle angular correlation function, C(Δη,Δϕ), with Δη and Δϕ differences in, respectively, pseudorapidities and azimuthal angles between two particles, reveal the resonance contributions and the near-side ridge. Model calculations of the two-particle cumulants, c2{2}, and second order flow harmonic, v2{2}, also performed using the two-subevent method, are in qualitative agreement with the data. The observed absence of the away-side ridge in the model results is interpreted as an imperfection in the definition of the time for the transverse evolution of the string system.
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